That's a great theory. Only problem is many of the SIVs - especially the petrodollar based ones - have huge investments in the very companies you're suggesting they "could" wipe out.
The biggest individual shareholder in C is a Saudi prince, IMO it is ludicrous to think a petrodollar fund in Norway is going to even think about shorting that guy. Barclays was the third largest shareholde in Lehman - and Barclay's largest shareholder is Quatar - more petrodollars. Etc etc etc, similar stories up and down the line of the headline US financial names.
What you are describing would mean these guys & gals are shorting stuff they already own. I know people can be stupid at times, but it's rare to find them THAT stupid...
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